Read compositor VSync information from platform, when possible

content/browser/compositor/gpu_process_transport_factory.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/compositor/gpu_process_transport_factory.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 199 matching lines @@
       LOG(FATAL) << "Failed to create UI context, but can't use software"
                  " compositing with browser threaded compositing. Aborting.";
     }
 
     scoped_ptr<SoftwareBrowserCompositorOutputSurface> surface(
         new SoftwareBrowserCompositorOutputSurface(
             output_surface_proxy_,
             CreateSoftwareOutputDevice(compositor),
             per_compositor_data_[compositor]->surface_id,
             &output_surface_map_,
-            base::MessageLoopProxy::current().get(),
-            compositor->AsWeakPtr()));
+            compositor->vsync_manager()));
     return surface.PassAs<cc::OutputSurface>();
   }
 
   scoped_refptr<base::SingleThreadTaskRunner> compositor_thread_task_runner =
       ui::Compositor::GetCompositorMessageLoop();
   if (!compositor_thread_task_runner.get())
     compositor_thread_task_runner = base::MessageLoopProxy::current();
 
   // Here we know the GpuProcessHost has been set up, because we created a
   // context.
   output_surface_proxy_->ConnectToGpuProcessHost(
       compositor_thread_task_runner.get());
 
   scoped_ptr<BrowserCompositorOutputSurface> surface(
       new GpuBrowserCompositorOutputSurface(
           context_provider,
           per_compositor_data_[compositor]->surface_id,
           &output_surface_map_,
-          base::MessageLoopProxy::current().get(),
-          compositor->AsWeakPtr()));
+          compositor->vsync_manager()));
   if (data->reflector.get()) {
     data->reflector->CreateSharedTexture();
     data->reflector->AttachToOutputSurface(surface.get());
   }
 
   return surface.PassAs<cc::OutputSurface>();
 }
 
 scoped_refptr<ui::Reflector> GpuProcessTransportFactory::CreateReflector(
     ui::Compositor* source,
@@ skipping 229 matching lines @@
                     observer_list_,
                     OnLostResources());
 
   // Kill things that use the shared context before killing the shared context.
   lost_gl_helper.reset();
   lost_offscreen_compositor_contexts = NULL;
   lost_shared_main_thread_contexts  = NULL;
 }
 
 }  // namespace content